Most sagging garage doors are the roll up variety as opposed to the single planked swing up variety.
Garage door sagging in the middle.
In other cases the weight of the garage door in conjunction with an automatic garage door that is attached to the center of the door may be the cause of bowing.
There are things you can do yourself to fix the problem although they may not be as permanent as having a professional fix it.
A wooden garage door may sag in the middle if it is bumped with a car or other large object in the garage but there are less obvious reasons that can cause such a door to sag.
Indeed with a few turns of a screwdriver you can have that door level as concrete.
While the most thorough and sure way to eliminate the problem is by getting a structural engineer in to look at the garage take measurements and fix the sag.
If the tracks have become misaligned then it s not too difficult to fix them.
You can do this.
When it comes to shoring up that sagging garage door there are no quick fixes.
A sagging garage header is essentially a structural engineering problem.
Getting your garage door in tight lean condition requires a bit if elbow grease and a good set of hand tools.
It could be the case that a strut needs to be installed in order to keep it working as it should.